I have never seen that movie but I do know of it--I think it's based on a real story too, isn't it?
I do think JKR probably felt there was only so much she could do with the Malfoys, though it also does seem like they stand against the principles of the series just by being this type. Like, when Ron punches Draco after they save him the second time, it seems like the rebuke is clear: How dare you say you're on their side after we saved you? Even though Draco's obviously not really swearing allegience to the DE. Or that "Then you should have died!" from Sirius to Peter (though in Peter's case, of course, he really did betray his friends). I get the feeling JKR might not have much respect for this kind of hero, or someone who doesn't declare a side.
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I do think JKR probably felt there was only so much she could do with the Malfoys, though it also does seem like they stand against the principles of the series just by being this type. Like, when Ron punches Draco after they save him the second time, it seems like the rebuke is clear: How dare you say you're on their side after we saved you? Even though Draco's obviously not really swearing allegience to the DE. Or that "Then you should have died!" from Sirius to Peter (though in Peter's case, of course, he really did betray his friends). I get the feeling JKR might not have much respect for this kind of hero, or someone who doesn't declare a side.